US4663657A - Image pickup apparatus for endoscopes - Google Patents
Image pickup apparatus for endoscopes Download PDFInfo
- Publication number
- US4663657A US4663657A US06/645,309 US64530984A US4663657A US 4663657 A US4663657 A US 4663657A US 64530984 A US64530984 A US 64530984A US 4663657 A US4663657 A US 4663657A
- Authority
- US
- United States
- Prior art keywords
- image pickup
- optical
- optical system
- observed
- solid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/04—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor combined with photographic or television appliances
- A61B1/05—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor combined with photographic or television appliances characterised by the image sensor, e.g. camera, being in the distal end portion
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/555—Constructional details for picking-up images in sites, inaccessible due to their dimensions or hazardous conditions, e.g. endoscopes or borescopes
Definitions
- the present invention relates to an image pickup apparatus for an endoscope, and more particularly, to an apparatus for producing an image of an object to be observed under illumination of light emitted from an illumination optical system of the endoscope employing a solid-state image pickup device.
- the known solid-state image pickup device adapted to be used in an endoscope include charge transfer device such as a charge coupled device (CCD), a bucket brigade device (BBD) and a charge priming device (CPD), a static induction transistor (SIT) type and a metal oxide semiconductor (MOS) type.
- charge transfer device such as a charge coupled device (CCD), a bucket brigade device (BBD) and a charge priming device (CPD), a static induction transistor (SIT) type and a metal oxide semiconductor (MOS) type.
- a white color illumination lamp generally in use radiates more energy in an infrared ray wavelength zone than in a visual ray wavelength zone and the spectral properties of an illumination optical system and an image pickup optical system including all elements such as a lens system, a light guide and a solid-state image pickup device are not uniform so that it is difficult to reproduce a faithful color image.
- an image pickup apparatus for an endoscope employing a solid-state image pickup device is constructed such that an optical filter or filters for correcting the spectral properties of the overall optical path in both of an illumination optical system and an image pickup optical system or an optical filter or filters having the color tones suitable for an object to be observed are disposed in the optical path of at least one of the illumination optical system and the image pickup optical system, thereby permitting to reproduce a faithful image or to make a clear image.
- an image pickup apparatus for an endoscope having a solid-state image pickup device is effective in reproducing a faithful color image of an object to be observed since an optical filter or filters for correcting the spectral properties of the overall optical path including an illumination optical system and an image pickup optical system are disposed on the optical path of at least one of the illumination optical system and the image pickup optical system.
- the apparatus is effective in making a clear image since an optical filter or filters having the color tones suitable for the object to be observed are disposed to obtain proper illumination light.
- FIG. 1 is a schematic diagram illustrating an an embodiment of an image pickup apparatus for endoscopes according to the present invention.
- FIGS. 2 and 3 are sectional views of the essential parts of respective other embodiments of an image pickup apparatus for endoscopes according to the present invention.
- a mosaic-like optical filter for the three primary colors (not shown), through which each color-wavelength light alone is allowed to transmit, is mounted on the image pickup plane of the image pickup device 4 so that a signal corresponding to each of picture elements, which signal is transmitted through the filter for transmitting three color light of red, green and blue, sequentially developed from three output terminals, for example, by a clock signal applied to the image pickup device 4.
- the developed signals are amplified by a preamplifier 5 having a low noise factor and are further amplified sufficiently by color amplifiers 7R, 7G and 7B in the rear stage through signal cables 6.
- the clock signal which is applied to the image pickup device 4 in order to read a signal corresponding to each of the picture elements is produced from a signal reader 8.
- the clock signal is formed by a reference signal from a reference oscillator 9.
- the reference signal is applied to a horizontal deflector 10 and a vertical deflector 11 to form horizontal and a vertical deflection signals, respectively, which are applied to the X and Y deflection terminals of a color Brown tube 12.
- Color signals R, G and B of red, green and blue which are produced from the color amplifiers 7R, 7G and 7B are displayed on the color Brown tube 12 while being swept.
- a light guide 13 made of a fiber bundle for transmitting illumination light is inserted into the insertion portion 2 of the endoscope 1.
- the distal (front) end of the light guide 13 is secured to the distal end inner wall of the insertion portion 2.
- An illumination window in front of the distal end of the light guide 13 is covered with a light distribution lens 14.
- the rear end of the light guide 13 is detachably mounted on a light source 15 through a light guide cable extending from the rear end of the insertion portion 2.
- a white color illumination lamp 16 is disposed within the light source 15. Illumination light from the lamp 16 is reflected by a concave reflecting mirror 17 to form a substantially parallel light beam. The light beam is further converged to illuminate the rear end plane (incident plane) of the light guide 13.
- An optical filter for correction 20 is disposed on the optical path between the lamp 16 and a condenser lens 18.
- the purpose of filter 20 is to give weight to the spectral properties of the illumination light in order to correct the spectral image pickup properties of the whole optical path including the illuminating optical system comprising lamp 16, condenser lens 18, light guide cable and light distribution lens 14 and the image pickup optical system comprising objective optical system 3 and solid-state image pickup device 4.
- a color filter suitable for a particular object to be observed is employed as the filter 20.
- a color filter of the blue group is employed in the case of discriminating between an affected part and a normal part in a coeliac cavity.
- the image pickup apparatus for endoscopes of the structure according to the foregoing embodiment it is possible to reproduce a faithful color image since the optical filter 20 for correcting the spectral image pickup properties of the whole optical path including the illuminating optical system from the lamp 16 through the object to be observed to the image pickup device 4 and the image pickup optical system is interposed between the lamp 16 and the condenser lens 18.
- a color filter suitable for a particular object to be observed it is possible to make a clear image of the object to be observed.
- a color filter of the blue group is used for inspection of a coeliac cavity, it is possible to easily discriminate between an affected part and a normal part.
- FIG. 2 which illustrates a second embodiment of the present invention
- an image pickup apparatus for an endoscope is provided with an optical filter 20 for correction which is similar to that in the first embodiment, which is interposed between the distal (front) end of a light guide 13 in an insertion portion 2 and a light distribution lens 14.
- the others are similar to parts in the first embodiment.
- the image pickup apparatus thus constructed has the same actions and effects as in the first embodiment.
- an image pickup apparatus employs a midget lamp 21 (or a plurality of midget lamps when the amount of illumination light is insufficient) in place of the light guide 13 in the second embodiment shown in FIG. 2.
- the lamp 21 is disposed in face of the light distribution lens 14 within the insertion portion 2.
- An optical filter 20 for correction which is similar to that in the first and second embodiments is interposed between an objective optical system 3 and a solid-state image pickup device 4. It is to be noted that a (high brightness) light emission diode may be used in place of the midget lamp 21.
- the image pickup apparatus constructed as just described has the same actions and effects as in the first embodiment.
- Each of a foregoing embodiments is of the system employing a mosaic-like three primary color filter in a single solid-state image pickup device. It is to be noted that a system employing three separate solid-state image pickup devices responsive to respective three primary color images of red, green and blue into which an image of an object to be observed is decomposed or a system that sequentially develops three primary color component picture images from a single solid-state image pickup device, for example, by rotating three color filters of red, green and blue at a predetermined rotational speed on the part of the light source, may be employed. Specifically, the object of the present invention will be accomplished when an optical filter for correction is disposed at any point in the optical path from a light source through an object to be observed to a solid-state image pickup element.
- the optical filter may be of the weighted spectral properties of red, green and blue or of such nature that the spectral properties are correctable with regard to any one of red, green and blue or a combination of two or more thereof.
- a plurality of optical filters may be arranged in a plurality of positions.
- the illumination optical system and the image pickup optical system are formed in a unitary manner in the foregoing embodiments, both may be formed separately.
Abstract
Description
Claims (5)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58163596A JPH0685762B2 (en) | 1983-09-05 | 1983-09-05 | Endoscopic imaging device |
JP58-163596 | 1983-09-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
US4663657A true US4663657A (en) | 1987-05-05 |
Family
ID=15776922
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US06/645,309 Expired - Lifetime US4663657A (en) | 1983-09-05 | 1984-08-29 | Image pickup apparatus for endoscopes |
Country Status (3)
Country | Link |
---|---|
US (1) | US4663657A (en) |
JP (1) | JPH0685762B2 (en) |
DE (1) | DE3432157A1 (en) |
Cited By (33)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4716457A (en) * | 1986-02-27 | 1987-12-29 | Kabushiki Kaisha Toshiba | Electronic endoscopic system |
US4746975A (en) * | 1985-12-06 | 1988-05-24 | Olympus Optical Co., Ltd. | Electronic endscope apparatus |
US4773396A (en) * | 1986-08-11 | 1988-09-27 | Olympus Optical Co., Ltd. | Endoscope |
US4819077A (en) * | 1986-05-14 | 1989-04-04 | Kabushiki Kaisha Toshiba | Color image processing system |
US4885635A (en) * | 1987-02-17 | 1989-12-05 | Olympus Optical Co., Ltd. | Endoscope light source apparatus |
US4933758A (en) * | 1988-10-27 | 1990-06-12 | Olympus Optical Co., Ltd. | Signal processing apparatus with a movement detecting device and an outline enhancement device |
US20050206402A1 (en) * | 2004-03-22 | 2005-09-22 | Jianou Shi | Methods and systems for determining one or more properties of a specimen |
US20060069305A1 (en) * | 2004-09-30 | 2006-03-30 | Boston Scientific Scimed, Inc. | Device with enhanced indication of use and prevention of re-use |
US20070046778A1 (en) * | 2005-08-31 | 2007-03-01 | Olympus Corporation | Optical imaging device |
US7241263B2 (en) | 2004-09-30 | 2007-07-10 | Scimed Life Systems, Inc. | Selectively rotatable shaft coupler |
US7413543B2 (en) | 2003-04-01 | 2008-08-19 | Scimed Life Systems, Inc. | Endoscope with actively cooled illumination sources |
US7479106B2 (en) | 2004-09-30 | 2009-01-20 | Boston Scientific Scimed, Inc. | Automated control of irrigation and aspiration in a single-use endoscope |
US20090207240A1 (en) * | 2004-01-20 | 2009-08-20 | Texas Instruments Incorporated | Electronic endoscope and endoscope system using same |
US7578786B2 (en) | 2003-04-01 | 2009-08-25 | Boston Scientific Scimed, Inc. | Video endoscope |
US7591783B2 (en) | 2003-04-01 | 2009-09-22 | Boston Scientific Scimed, Inc. | Articulation joint for video endoscope |
US7597662B2 (en) | 2004-09-30 | 2009-10-06 | Boston Scientific Scimed, Inc. | Multi-fluid delivery system |
US20100145146A1 (en) * | 2005-12-28 | 2010-06-10 | Envisionier Medical Technologies, Inc. | Endoscopic digital recording system with removable screen and storage device |
US7846107B2 (en) | 2005-05-13 | 2010-12-07 | Boston Scientific Scimed, Inc. | Endoscopic apparatus with integrated multiple biopsy device |
US7955255B2 (en) | 2006-04-20 | 2011-06-07 | Boston Scientific Scimed, Inc. | Imaging assembly with transparent distal cap |
US7967759B2 (en) | 2006-01-19 | 2011-06-28 | Boston Scientific Scimed, Inc. | Endoscopic system with integrated patient respiratory status indicator |
US8052597B2 (en) | 2005-08-30 | 2011-11-08 | Boston Scientific Scimed, Inc. | Method for forming an endoscope articulation joint |
US8083671B2 (en) | 2004-09-30 | 2011-12-27 | Boston Scientific Scimed, Inc. | Fluid delivery system for use with an endoscope |
US8097003B2 (en) | 2005-05-13 | 2012-01-17 | Boston Scientific Scimed, Inc. | Endoscopic apparatus with integrated variceal ligation device |
US8118732B2 (en) | 2003-04-01 | 2012-02-21 | Boston Scientific Scimed, Inc. | Force feedback control system for video endoscope |
US8157726B2 (en) | 2004-12-28 | 2012-04-17 | Envisionier Medical Technologies Llc | Endoscopic imaging system |
US8199187B2 (en) | 2004-09-30 | 2012-06-12 | Boston Scientific Scimed, Inc. | Adapter for use with digital imaging medical device |
US8202265B2 (en) | 2006-04-20 | 2012-06-19 | Boston Scientific Scimed, Inc. | Multiple lumen assembly for use in endoscopes or other medical devices |
US8353860B2 (en) | 2004-09-30 | 2013-01-15 | Boston Scientific Scimed, Inc. | Device for obstruction removal with specific tip structure |
US8357148B2 (en) | 2004-09-30 | 2013-01-22 | Boston Scientific Scimed, Inc. | Multi-functional endoscopic system for use in electrosurgical applications |
US8535219B2 (en) | 2003-04-01 | 2013-09-17 | Boston Scientific Scimed, Inc. | Fluid manifold for endoscope system |
US8888684B2 (en) | 2006-03-27 | 2014-11-18 | Boston Scientific Scimed, Inc. | Medical devices with local drug delivery capabilities |
US20210084731A1 (en) * | 2018-06-19 | 2021-03-18 | Iris Communication Kabushiki Kaisha | Illumination light adjusting system, illumination light adjusting method, and non-transitory computer-readable storage medium |
US11963280B2 (en) * | 2018-06-19 | 2024-04-16 | Iris Communication Kabushiki Kaisha | Illumination light adjusting system, illumination light adjusting method, and non- transitory computer-readable storage medium |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2644991B2 (en) * | 1985-09-20 | 1997-08-25 | 株式会社東芝 | Endoscope device |
US4831444A (en) * | 1986-11-06 | 1989-05-16 | Olympus Optical Co., Ltd. | Video camera device with separate camera head and signal processing circuit |
JPH0341416A (en) * | 1989-07-07 | 1991-02-21 | Fuji Photo Film Co Ltd | Color liquid crystal shutter matrix |
JP2669743B2 (en) * | 1991-12-25 | 1997-10-29 | 株式会社東芝 | Endoscope device |
JP2669742B2 (en) * | 1991-12-25 | 1997-10-29 | 株式会社東芝 | Endoscope device |
JP2005204944A (en) * | 2004-01-22 | 2005-08-04 | Chinontec Kk | Endoscope |
JP5974192B2 (en) * | 2014-06-16 | 2016-08-23 | オリンパス株式会社 | Marking system |
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US3456641A (en) * | 1964-09-30 | 1969-07-22 | Tokyo Shibaura Electric Co | Flexible endoscope for photographing diseased parts in cancer diagnosis |
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JPS5346189A (en) * | 1976-10-07 | 1978-04-25 | Fuji Photo Optical Co Ltd | Endscope |
JPS55123279A (en) * | 1979-03-16 | 1980-09-22 | Olympus Optical Co Ltd | Surface-sequence color television pickup unit |
JPS589635A (en) * | 1981-07-08 | 1983-01-20 | 井本 一 | Production of gag |
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1983
- 1983-09-05 JP JP58163596A patent/JPH0685762B2/en not_active Expired - Lifetime
-
1984
- 1984-08-29 US US06/645,309 patent/US4663657A/en not_active Expired - Lifetime
- 1984-08-31 DE DE19843432157 patent/DE3432157A1/en active Granted
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Cited By (52)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4746975A (en) * | 1985-12-06 | 1988-05-24 | Olympus Optical Co., Ltd. | Electronic endscope apparatus |
US4716457A (en) * | 1986-02-27 | 1987-12-29 | Kabushiki Kaisha Toshiba | Electronic endoscopic system |
US4819077A (en) * | 1986-05-14 | 1989-04-04 | Kabushiki Kaisha Toshiba | Color image processing system |
US4773396A (en) * | 1986-08-11 | 1988-09-27 | Olympus Optical Co., Ltd. | Endoscope |
US4885635A (en) * | 1987-02-17 | 1989-12-05 | Olympus Optical Co., Ltd. | Endoscope light source apparatus |
US4933758A (en) * | 1988-10-27 | 1990-06-12 | Olympus Optical Co., Ltd. | Signal processing apparatus with a movement detecting device and an outline enhancement device |
US8535219B2 (en) | 2003-04-01 | 2013-09-17 | Boston Scientific Scimed, Inc. | Fluid manifold for endoscope system |
US8622894B2 (en) | 2003-04-01 | 2014-01-07 | Boston Scientific Scimed, Inc. | Articulation joint |
US11324395B2 (en) | 2003-04-01 | 2022-05-10 | Boston Scientific Scimed, Inc. | Endoscopic imaging system |
US10765307B2 (en) | 2003-04-01 | 2020-09-08 | Boston Scientific Scimed, Inc. | Endoscopic imaging system |
US8425408B2 (en) | 2003-04-01 | 2013-04-23 | Boston Scientific Scimed, Inc. | Articulation joint for video endoscope |
US7413543B2 (en) | 2003-04-01 | 2008-08-19 | Scimed Life Systems, Inc. | Endoscope with actively cooled illumination sources |
US8118732B2 (en) | 2003-04-01 | 2012-02-21 | Boston Scientific Scimed, Inc. | Force feedback control system for video endoscope |
US8475366B2 (en) | 2003-04-01 | 2013-07-02 | Boston Scientific Scimed, Inc. | Articulation joint for a medical device |
US7578786B2 (en) | 2003-04-01 | 2009-08-25 | Boston Scientific Scimed, Inc. | Video endoscope |
US7591783B2 (en) | 2003-04-01 | 2009-09-22 | Boston Scientific Scimed, Inc. | Articulation joint for video endoscope |
US8608648B2 (en) | 2003-04-01 | 2013-12-17 | Boston Scientific Scimed, Inc. | Articulation joint |
US9913573B2 (en) | 2003-04-01 | 2018-03-13 | Boston Scientific Scimed, Inc. | Endoscopic imaging system |
US20090207240A1 (en) * | 2004-01-20 | 2009-08-20 | Texas Instruments Incorporated | Electronic endoscope and endoscope system using same |
US20050206402A1 (en) * | 2004-03-22 | 2005-09-22 | Jianou Shi | Methods and systems for determining one or more properties of a specimen |
USRE46007E1 (en) | 2004-09-30 | 2016-05-24 | Boston Scientific Scimed, Inc. | Automated control of irrigation and aspiration in a single-use endoscope |
US7597662B2 (en) | 2004-09-30 | 2009-10-06 | Boston Scientific Scimed, Inc. | Multi-fluid delivery system |
US8357148B2 (en) | 2004-09-30 | 2013-01-22 | Boston Scientific Scimed, Inc. | Multi-functional endoscopic system for use in electrosurgical applications |
US8083671B2 (en) | 2004-09-30 | 2011-12-27 | Boston Scientific Scimed, Inc. | Fluid delivery system for use with an endoscope |
US20060069305A1 (en) * | 2004-09-30 | 2006-03-30 | Boston Scientific Scimed, Inc. | Device with enhanced indication of use and prevention of re-use |
US7479106B2 (en) | 2004-09-30 | 2009-01-20 | Boston Scientific Scimed, Inc. | Automated control of irrigation and aspiration in a single-use endoscope |
US8435172B2 (en) | 2004-09-30 | 2013-05-07 | Boston Scientific Scimed, Inc. | Automated control of irrigation and aspiration in a single-use endoscope |
US8197400B2 (en) | 2004-09-30 | 2012-06-12 | Boston Scientific Scimed, Inc. | Selectively rotatable shaft coupler |
US8199187B2 (en) | 2004-09-30 | 2012-06-12 | Boston Scientific Scimed, Inc. | Adapter for use with digital imaging medical device |
US7241263B2 (en) | 2004-09-30 | 2007-07-10 | Scimed Life Systems, Inc. | Selectively rotatable shaft coupler |
US8353860B2 (en) | 2004-09-30 | 2013-01-15 | Boston Scientific Scimed, Inc. | Device for obstruction removal with specific tip structure |
US8157726B2 (en) | 2004-12-28 | 2012-04-17 | Envisionier Medical Technologies Llc | Endoscopic imaging system |
US8585715B2 (en) | 2005-05-13 | 2013-11-19 | Boston Scientific Scimed, Inc. | Endoscopic apparatus with integrated variceal ligation device |
US7846107B2 (en) | 2005-05-13 | 2010-12-07 | Boston Scientific Scimed, Inc. | Endoscopic apparatus with integrated multiple biopsy device |
US8097003B2 (en) | 2005-05-13 | 2012-01-17 | Boston Scientific Scimed, Inc. | Endoscopic apparatus with integrated variceal ligation device |
US8052597B2 (en) | 2005-08-30 | 2011-11-08 | Boston Scientific Scimed, Inc. | Method for forming an endoscope articulation joint |
US10052013B2 (en) | 2005-08-30 | 2018-08-21 | Boston Scientific Scimed, Inc. | Medical device comprising segments |
US11191424B2 (en) | 2005-08-30 | 2021-12-07 | Boston Scientific Scimed, Inc. | Method for forming an endoscope articulation joint |
US9439557B2 (en) | 2005-08-30 | 2016-09-13 | Boston Scientific Scimed, Inc. | Articulation joint |
US20070046778A1 (en) * | 2005-08-31 | 2007-03-01 | Olympus Corporation | Optical imaging device |
US8169470B2 (en) | 2005-08-31 | 2012-05-01 | Olympus Medical Systems Corp. | Optical imaging device having illumination light filter section |
EP1759628A1 (en) * | 2005-08-31 | 2007-03-07 | Olympus Corporation | Optical and fluorescence imaging device for insertion into a body cavity |
US20100145146A1 (en) * | 2005-12-28 | 2010-06-10 | Envisionier Medical Technologies, Inc. | Endoscopic digital recording system with removable screen and storage device |
US7967759B2 (en) | 2006-01-19 | 2011-06-28 | Boston Scientific Scimed, Inc. | Endoscopic system with integrated patient respiratory status indicator |
US8888684B2 (en) | 2006-03-27 | 2014-11-18 | Boston Scientific Scimed, Inc. | Medical devices with local drug delivery capabilities |
US9358363B2 (en) | 2006-04-20 | 2016-06-07 | Boston Scientific Scimed, Inc. | Multiple lumen assembly for use in endoscopes or other medical devices |
US8202265B2 (en) | 2006-04-20 | 2012-06-19 | Boston Scientific Scimed, Inc. | Multiple lumen assembly for use in endoscopes or other medical devices |
US8870753B2 (en) | 2006-04-20 | 2014-10-28 | Boston Scientific Scimed, Inc. | Imaging assembly with transparent distal cap |
US7955255B2 (en) | 2006-04-20 | 2011-06-07 | Boston Scientific Scimed, Inc. | Imaging assembly with transparent distal cap |
US20210084731A1 (en) * | 2018-06-19 | 2021-03-18 | Iris Communication Kabushiki Kaisha | Illumination light adjusting system, illumination light adjusting method, and non-transitory computer-readable storage medium |
US11963280B2 (en) * | 2018-06-19 | 2024-04-16 | Iris Communication Kabushiki Kaisha | Illumination light adjusting system, illumination light adjusting method, and non- transitory computer-readable storage medium |
US11957312B2 (en) | 2021-11-04 | 2024-04-16 | Boston Scientific Scimed, Inc. | Method for forming an endoscope articulation joint |
Also Published As
Publication number | Publication date |
---|---|
DE3432157C2 (en) | 1987-10-22 |
JPH0685762B2 (en) | 1994-11-02 |
DE3432157A1 (en) | 1985-04-04 |
JPS6053925A (en) | 1985-03-28 |
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